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Questions tagged [wdm]

Windows Driver Model is a framework for device drivers that was introduced with Windows 98 and Windows 2000 to replace VxD. It was later replaced with Windows Driver Foundation (WDF).

134 questions
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UMDF, cannot specify [ClassInstall32] section for Microsoft-defined class

I'm working with the next tutorial: How to write your first USB client driver. And I've got a problem with compiling a project, I've got the next error: I was trying to do the steps closely to the description in tutorial, but always got the error…
user4959035
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How does a Windows Kernel mode Driver, access paged memory?

1) A usermode process has its own "address context", which maps the user-mode virtual addresses to a unique collection of physical page frames. That is, the meaning of any particular virtual address changes from one moment to the next as the Windows…
bakra
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Persistently write to a file from windows kernel driver

Hi I'm new to kernel level programming and trying to build a simple log writing driver. What I'm trying to achieve is to have a persistent driver will write referred text every predefined interval to a file in system path. (I'm not familiar IRQ…
Antonio Rodriguez
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why we can access memory from non paged pool at or above DISPATCH LEVEL

As I know that if IRQL level is dispatch then you can access memory from non paged pool. if we will try to access memory from paged pool.just wanted to know why ?
MM WDD
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How to get current working directory from windows kernel mode driver code?

I am writing a Windows kernel mode driver which uses API PsSetCreateProcessNotifyRoutineEx In its callback function, I need to get the current working directory of process. How this can be done? Any ideas, leads would be very useful. Thanks in…
Hemant
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Linker error when compiling windows kernel mode driver x64

I'm trying to compile the sysvad audio driver example found here: https://github.com/Microsoft/Windows-driver-samples/tree/master/audio/sysvad Getting a linker error when compiling windows kernel mode driver x64 error LNK2019: unresolved external…
Nick
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Route ASIO input to WDM virtual microphones

I'm doing some sound manipulation with the Dante Virtual Soundcard (DVS). The software I am using (ffmpeg) can only record from WDM microphones. DVS has a limitation of 8 stereo channels for WDM, so I'm seeing if I can use the 64 channel ASIO…
JohnX
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Iterating over WDM device stack

As I understand, one can iterate the device stack of WDM devices only from the bottoms up, because DEVICE_OBJECT has an AttachedDevice member (but not a LowerDevice member). Luckily, the AddDevice callback receives the PhysicalDeviceObject so you…
Ilya
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How to emulate SCSI device

Let's sketch the picture. Windows provides SCSI port (bus) driver. Driver creates FDO for bus (FILE_DEVICE_BUS_EXTENDER) and PDO for each device connected to bus (FILE_DEVICE_MASS_STORAGE). We "connect" mass storage devices to bus device inside PnP…
igntec
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IoBuildAsynchronousFsdRequest with IRP_MJ_WRITE

I developed a WDM filter driver on disk driver. I want to send an asynchronous request to write data on disk. The windows will crash when I delete the writeBuffer memory in WriteDataIRPCompletion function. My question is: How can I safely free the…
JoeHsu
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DDK/WDM import wink32.lib into driver

Recently I was trying to use W32pServiceTable in my driver. I did imported wink32.lib in SOURCES: TARGETNAME=exp TARGETTYPE=DRIVER TARGETLIB=$(DDK_LIB_PATH)\win32k.lib SOURCES=Experimental.cpp MSC_WARNING_LEVEL=/W3 And I declare in source…
Vasilij
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How to register acpi event notify?(AcpiInterfaces.RegisterForDeviceNotifications)

now I want to add the function in my acpi driver . the function is:get the BIOS Notify . I search some doc, And Write code NTSTATUS XxxAddDevice( __in struct _DRIVER_OBJECT *DriverObject, __in struct _DEVICE_OBJECT *PhysicalDeviceObject …
LeenLi
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Two Spinlocks on same processor?

Can two CPUs hold two "different" spin locks simultaneously at same time? So...does this mean: a sigle(uniprocessor) CPU cannot hold two "different" spinlocks at the same time? So...does this mean: the number of spinlocks on a single CPU cannot be…
bakra
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When to use Wave Extensible Format?

I'm writing an audio library that includes reading and writing wave files and I understand the differences between the three possible wave file formats, but it's unclear when to use the extensible format when dealing with mono or stereo PCM data.…
riban
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Get keyboard (PS/2) scan code set, using asm

I would like to get my keyboard current scan code set. Code that I am using looks more or less like this: #define STATUSPORT 64h #define DATAPORT 60h #define PS2controllerOutputFull 0x20 #define PS2controllerInputFull 2h void sendByte() { …
ladan
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